AllocationProfiler: introduce allocation_profiler flag in V8 api.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 8a73877eedec4b395078d7c7f2f84b103c5df763..c76539344e0694e60dbd4406db8a9ef201bcc0b3 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -283,9 +283,12 @@ static inline bool EmptyCheck(const char* location, const v8::Data* obj) {
 
 
 static bool InitializeHelper(i::Isolate* isolate) {
-  // If the isolate has a function entry hook, it needs to re-build all its
-  // code stubs with entry hooks embedded, so let's deserialize a snapshot.
-  if (isolate == NULL || isolate->function_entry_hook() == NULL) {
+  // If the isolate has a function entry hook or enabled allocation profiler,
+  // it needs to re-build all its code stubs with embedded entry hooks
+  // or RecordObjectAllocation calls, so let's skip snapshot deserialization.
+  if (isolate == NULL || (
+        isolate->function_entry_hook() == NULL &&
+        !isolate->is_allocation_profiler_enabled())) {
     if (i::Snapshot::Initialize())
       return true;
   }
@@ -4993,6 +4996,20 @@ void v8::V8::SetReturnAddressLocationResolver(
 }
 
 
+bool v8::V8::EnableAllocationProfiler(Isolate* ext_isolate) {
+  ASSERT(ext_isolate != NULL);
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(ext_isolate);
+  return isolate->enable_allocation_profiler();
+}
+
+
+bool v8::V8::IsAllocationProfilerEnabled(Isolate* ext_isolate) {
+  ASSERT(ext_isolate != NULL);
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(ext_isolate);
+  return isolate->is_allocation_profiler_enabled();
+}
+
+
 bool v8::V8::SetFunctionEntryHook(Isolate* ext_isolate,
                                   FunctionEntryHook entry_hook) {
   ASSERT(ext_isolate != NULL);